My Take
I love Kahoot because it can be catered to vitually any content and any grade level. I have used it with 1st graders - 5th graders but have talked to junior high and high school students wholove it as well.
How I Use It
I have used Kahoot as a way to guage student understanding after a lesson (library orientation, research skills). I have also created a Kahoot that goes with our Maine Student Book Award. We play the Kahoot after students have had the chance to read many of the books. This builds excitement before student voting.